Font control

Can anyone recommend a way to adjust the size of the fonts in the widget-title and the widget body?

I’ve installed “Custom CSS” and tried to put in instructions to adjust those sizes, but something else must be controlling the size because the site is ignoring my commands. Here’s what I added in:

.widget-title a {
font-size: 16px;
}

I’m not really knowledgeable with css, I’m just using “Inspect element” to find out what class the parts of the website are and then copying the sytax that’s already in my custom css plugin.

My site is ryanvideo.com. I’m trying to make the widgets look like – well widgets – and not a separate column of posts. As you can see, the posts & the widgets display the same, except for color.

Thanks if anyone has any ideas.